UltraCMOS® RF Digital Step Attenuator 6-bit, 31.5 dB, 1 MHz – 4 GHz. The PE4312 is a 50Ω, HaRP™ technology-enhanced 6-bit RF Digital Step Attenuator (DSA) designed for use in 3G/4G wireless infrastructure and other high performance RF applications. Covering a 31.5 dB attenuation range in 0.5 dB steps, it maintains high linearity and low power consumption from 1 MHz through 4 GHz. PE4312 also features an external negative supply option, and is offered in a 20-lead 4x4 mm QFN package. In addition, no external blocking capacitors are required if 0V DC is present on the RF ports.